https://www.nhs.uk/news/obesity/bmi-categories-may-need-adjusting-argue-researchers/
> New research has found a body mass index (BMI) of 27 is linked to the lowest rate of death
> Researchers looked at 120,528 people from Copenhagen, recruited from 1976 to 2013, and separately compared those recruited during the 1970s, 1990s and 2000s. They were followed up until they died, emigrated, or the study finished.
> The BMI linked to the lowest risk of having died from any cause was 23.7 in the 1970s group, 24.6 in the 1990s group, and had further risen to 27 in the 2003-13 group.
> It may be the case that the suggested upward shift in optimal BMI is the result of improvements in preventative treatments for weight-related conditions such as type 2 diabetes.
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